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ROI
3.9-Years
If you have timber floors, mineral wool insulation* can be used between the joists to insulate your floor.  Assuming this is the only insulation measure installed in your house you can reduce the amount of heat loss through your floor by about a half and can therefore reduce your energy bill by about 7 or 8%.

To do this you need to be able to access under the floor via a trap door or you may have to lift all of the floor boards.  Professionally done this is an expensive job and may cost more than £ 1,000** .  DIY it may cost only a £ 100 for materials, but if t you have to lift your floor boards, it will be a long and difficult DIY task and will probably end up costing more than £ 100 when you find yourself repairing damage caused by lifting boards.  As a DIY task we have estimated the cost at closer to £ 300 for a smaller house.

 

This table shows savings with installing underfloor insulation and the reduction of carbon dioxide emissions for 4 different energy demands, Check your bills to see what you use.
Financial savings by installing underfloor insulation - per year
CO2 emission reduction - kg per year
Below average energy use for heating per year
smaller house or warmer area
Average energy use for heating per year
the average in the UK
Above average energy use for heating per year
larger house or colder area
Source of energy for heating Savings with
original energy use
10000 kWh
Savings with
original energy use
15000 kWh
Savings with
original energy use
20000 kWh
Savings with
original energy use
25000 kWh
⚡ Electricity £0.154 per kWh
£123.2 (293.6kg) £184.8 (440.4kg) £246.4 (587.2kg) £308 (734kg)
⚡ Gas £0.048 per kWh
£38.4 (168kg) £57.6 (252kg) £76.8 (336kg) £96 (420kg)
⚡ Off Peak Electricity £0.075 per kWh
£60 (293.6kg) £90 (440.4kg) £120 (587.2kg) £150 (734kg)
⚡ LPG £0.058 per kWh
£46.4 (184kg) £69.6 (276kg) £92.8 (368kg) £116 (460kg)
⚡ Heating Oil £0.043 per kWh
£34.4 (208kg) £51.6 (312kg) £68.8 (416kg) £86 (520kg)

Is it worth doing?

The payback time for under floor insulation is not bad. So it could be well worth it, but it is potentially a lot of disruption, perhaps it is best to install underfloor insulation when generally renovating a property.

This table shows the payback time for installing underfloor insulation based on the costs of the fuels used and various cost options for installing the insulation.
Source of energy for heating Insulation install costs
select yours.
Payback time with
original energy use
10000 kWh
(years)
Payback time with
original energy use
15000 kWh
(years)
Payback time with
original energy use
20000 kWh
(years)
⚡ Electric £0.154 per kWh
£0
£500
£1000
£1500
£2000
0
4.1
8.1
12.2
16.2
0
2.7
5.4
8.1
10.8
0
2
4.1
6.1
8.1
⚡ Gas £0.048 per kWh
£0
£500
£1000
£1500
£2000
0
13
26
39.1
52.1
0
8.7
17.4
26
34.7
0
6.5
13
19.5
26
⚡ Economy Electric £0.075 per kWh
£0
£500
£1000
£1500
£2000
0
8.3
16.7
25
33.3
0
5.6
11.1
16.7
22.2
0
4.2
8.3
12.5
16.7
⚡ LPG £0.058 per kWh
£0
£500
£1000
£1500
£2000
0
10.8
21.6
32.3
43.1
0
7.2
14.4
21.6
28.7
0
5.4
10.8
16.2
21.6
⚡ Heating Oil £0.043 per kWh
£0
£500
£1000
£1500
£2000
0
14.5
29.1
43.6
58.1
0
9.7
19.4
29.1
38.8
0
7.3
14.5
21.8
29.1
 

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